Quiz for Labs 1 & 2 IPS Study Guide

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REACTION IN A BAG stuff

ELEMENTS

Calcium-chloride (AKA Solid A):
  • acidic
  • produces heat when in contact avec liquids – exothermic
  • absorbs water aussi (AKA Hydrotopic)... (keeps canned food from getting mushy))


Sodium bicarbonate (AKA Solid B or Baking Soda)

  • "Takes away heat (energy)" when combined – endothermic
  • Not acidic
  • USED IN: baking, toothpaste, volcanoes :D, etc


Phenol Red (AKA Red Liquid ≠ Red Water)

  • Used as PH Indicator:
  • Below 7 (alkaline) = yellow
  • Above 7 (Acidic) = pink/red


Everything Combined!!!:

Yellow and Pink stuff, hot and cold, gas also produced

VOCABULARY

Exothermic – producing heat

Endothermic – losing tempurature

Hydrotropic – absorbs water

Experimental Error:

Small hole in bag – gas would not be seen


Heating Baking Soda (stuff)!

Test Tube

Damp: since the Heated Baking Soda (Solid B :D) was heated, the gas drifted up and since the hole was so small, the gas had to wait their turn. Waiting and touching the cold glass, then... CONDENSATION!!!

Bottle

The Bottle with water filled with air since, when the baking soda was heated, gas came out, went through the tube, and pushed the water out of the bottle, and into the bigger body of water.

(Heated) Baking Soda (and Tea)

When the Baking Soda was heated, gas came out and the Baking Soda turned into a different substance. This was found out after the Baking Soda and Heated Baking Soda were separately mixed with Tea: the mixture produced a different color, confirming that the Baking Soda and "Heated Baking Soda" are different substances.

Vocab and Stuff

Variable: A category you try to measure

Dependant Variable: Color of tea dependant on Baking Soda

Independant Variable: Causes a change in the Dependant Variable (Baking Soda)

Control Factors: Same type of tea; same amount of baking soda used, same amount of tea; same test tube

Control Factor – Unheated Baking Soda

Experimental Factor – Heated Baking Soda

Indicator – Tea

Expermental Errors

  • Hole in tubing or Stopper "not snug" – gas wont fill bottle
  • Not cleaning stirring rod before beginning (cuz of previous class) – contaminate


1.4 Measurement by Displacement of Water

Experimental Errors

  • Sand sticks to sides of wet cylinder–different amount
  • Pour water into sand–different amount of air


About 40% of airspace takes up "dry sand" volume


1.6 Mass: The Equal-Arm Balance

  • Equal-Arm Balance created in Ancient Egypt
  • 1 kilogram = 1000 grams

1.8 Sensitivity of the Balance

Sensitivity of [the] Balance: the lightest mass that you can expect the balance to detect +/- the margin of human error

Data

"Mass" will change from human/mechanical error if an object is massed several different times (but stay around the same weight)


Each balance can only detect a set amount of weight at a time; balances will vary in sensitivities


Coin History

Coins Before 1982: 95% Copper 5% Zinc


Coins After 1982 : 2.5% Copper 97.5% Zinc


1943

  • Made of Steel + Zinc
  • Copper needed for shell casings (WWII;bullets)
  • A 1942 COPPER penny is worth $82,500 o_O
  • About 10 left in the world

LAB SAFETY AKA Common Sense

Lab Safety

  • Test odors of liquids by wafting
  • Never waft solids
  • If something spills or breaks, tell Mr. Leeds INSTANTANEOUSLY
  • Wash hands with soap and water after handling chemicals
  • Never use force to remove or insert glass
  • Lab area must be clean before leaving class
  • Capping the alcohol burner puts out the flame because fire needs oxygen
  • Keep your goggles on until Mr. Leeds says to remove them
  • Nurse extension – 2828
  • Keep hair up (if you have long hair)
  • Roll up your sleeves
  • Don't abandon/leave a lit burner
  • Don't taste chemicals
  • Don't touch chemicals directly


Safety Equipment

  • Fire Extinguisher–puts out a fire
  • Fire Blanket–crawling with fire-resistant bacteria, wrap around someone on fire and it will help put fire out
  • Eye wash/shower–self-explanatory... like fire extinguisher ._.


METRIC SYSTEMATIC things

Volume = lwh

Graduated cylinder measures volume


Standard unit of Length = meters

1ml=1cm(cubed)